feat: add support for checksum generation for extra files

internal/pipe/checksums/checksums.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/apex/log"
 	"github.com/goreleaser/goreleaser/internal/artifact"
+	"github.com/goreleaser/goreleaser/internal/extrafiles"
 	"github.com/goreleaser/goreleaser/internal/pipe"
 	"github.com/goreleaser/goreleaser/internal/semerrgroup"
 	"github.com/goreleaser/goreleaser/internal/tmpl"
@@ -55,6 +56,22 @@ func (Pipe) Run(ctx *context.Context) (err error) {
 		return nil
 	}
 
+	extraFiles, err := extrafiles.Find(ctx.Config.Checksum.ExtraFiles)
+	if err != nil {
+		return err
+	}
+
+	for name, path := range extraFiles {
+		if _, err := os.Stat(path); os.IsNotExist(err) {
+			return fmt.Errorf("failed to checksum %s: %w", name, err)
+		}
+		artifactList = append(artifactList, &artifact.Artifact{
+			Name: name,
+			Path: path,
+			Type: artifact.UploadableFile,
+		})
+	}
+
 	g := semerrgroup.New(ctx.Parallelism)
 	sumLines := make([]string, len(artifactList))
 	for i, artifact := range artifactList {

internal/pipe/checksums/checksums_test.go

@@ -238,4 +238,84 @@ func TestDefaultSet(t *testing.T) {
 	require.Equal(t, "checksums.txt", ctx.Config.Checksum.NameTemplate)
 }
 
+func TestPipeCheckSumsWithExtraFiles(t *testing.T) {
+	const binary = "binary"
+	const checksums = "checksums.txt"
+	const extraFileFooRelPath = "./testdata/foo.txt"
+	const extraFileBarRelPath = "./testdata/**/bar.txt"
+	const extraFileFoo = "foo.txt"
+	const extraFileBar = "bar.txt"
+
+	tests := map[string]struct {
+		extraFiles []config.ExtraFile
+		want       []string
+	}{
+		"default": {
+			extraFiles: nil,
+			want: []string{
+				binary,
+			},
+		},
+		"one extra file": {
+			extraFiles: []config.ExtraFile{
+				{Glob: extraFileFooRelPath},
+			},
+			want: []string{
+				extraFileFoo,
+			},
+		},
+		"multiple extra files": {
+			extraFiles: []config.ExtraFile{
+				{Glob: extraFileFooRelPath},
+				{Glob: extraFileBarRelPath},
+			},
+			want: []string{
+				extraFileFoo,
+				extraFileBar,
+			},
+		},
+	}
+
+	for name, tt := range tests {
+		t.Run(name, func(t *testing.T) {
+			folder := t.TempDir()
+			file := filepath.Join(folder, binary)
+			require.NoError(t, os.WriteFile(file, []byte("some string"), 0o644))
+			ctx := context.New(
+				config.Project{
+					Dist:        folder,
+					ProjectName: binary,
+					Checksum: config.Checksum{
+						Algorithm:    "sha256",
+						NameTemplate: "checksums.txt",
+						ExtraFiles:   tt.extraFiles,
+					},
+				},
+			)
+
+			ctx.Artifacts.Add(&artifact.Artifact{
+				Name: binary,
+				Path: file,
+				Type: artifact.UploadableBinary,
+				Extra: map[string]interface{}{
+					"ID": "id-1",
+				},
+			})
+
+			require.NoError(t, Pipe{}.Run(ctx))
+
+			bts, err := os.ReadFile(filepath.Join(folder, checksums))
+
+			require.NoError(t, err)
+			for _, want := range tt.want {
+				if tt.extraFiles == nil {
+					require.Contains(t, string(bts), "61d034473102d7dac305902770471fd50f4c5b26f6831a56dd90b5184b3c30fc  "+want)
+				} else {
+					require.Contains(t, string(bts), "3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  "+want)
+				}
+			}
+		})
+	}
+}
+
 // TODO: add tests for LinuxPackage and UploadableSourceArchive

pkg/config/config.go

@@ -533,10 +533,11 @@ type Snapshot struct {
 
 // Checksum config.
 type Checksum struct {
-	NameTemplate string   `yaml:"name_template,omitempty"`
-	Algorithm    string   `yaml:"algorithm,omitempty"`
-	IDs          []string `yaml:"ids,omitempty"`
-	Disable      bool     `yaml:"disable,omitempty"`
+	NameTemplate string      `yaml:"name_template,omitempty"`
+	Algorithm    string      `yaml:"algorithm,omitempty"`
+	IDs          []string    `yaml:"ids,omitempty"`
+	Disable      bool        `yaml:"disable,omitempty"`
+	ExtraFiles   []ExtraFile `yaml:"extra_files,omitempty"`
 }
 
 // Docker image config.

www/docs/customization/checksum.md

@@ -30,6 +30,15 @@ checksum:
   # Disable the generation/upload of the checksum file.
   # Default is false.
   disable: true
+
+  # You can add extra pre-existing files to the checksums file.
+  # The filename on the checksums file will be the last part of the path (base). If
+  # another file with the same name exists, the latest one found will be used.
+  # Defaults to empty.
+  extra_files:
+    - glob: ./path/to/file.txt
+    - glob: ./glob/**/to/**/file/**/*
+    - glob: ./glob/foo/to/bar/file/foobar/override_from_previous
 ```
 
 !!! tip